Yes, I was about to write exactly the same. ASN.1 is not a serialization format but appears in the Category; BER, CER, DER, PER, XER are well-known serialization formats "of ASN.1" (strictly speaking, it's slightly more complicated).

so ASN.1 IMHO should even be removed from the Category after adding BER, CER, DER, PER, XER Steffen (talk) 13:17, 17 March 2011 (UTC)